Dental handpiece with a check valve

Details Dental handpiece with a check valve Dental handpiece with a check valve

1994-08-19

1995-11-07

O'Connor, Cary E.

Dentistry

Apparatus

Having intra-oral dispensing means

433114, A61C 110

Patent

active

054643503

ABSTRACT:
A dental handpiece has a coupling member in which a passage for delivering a coolant to a discharge nozzle at the head part is provided. In order to prevent a flow-back of contaminated fluid with bacteria past the handpiece, a check valve is provided and comprises a check valve member disposed in a recess that extends radially inward from an outer surface of the coupling member and receives a flexible portion for closing a portion of the passage. The flexible portion is such that when the fluid is turned off, a suction in the fluid line will cause the flexible member to be pressed against the base of the recess and to prevent dripping from the exit nozzle.

REFERENCES:
patent: 4607627 (1986-08-01), Leber et al.
Abstract of Japanese Published Application No. 4 307 057 (Oct. 29, 1992) Patent Abstracts of Japan, vol. 17, No. 131 (C-1036) 18 Mar. 1993.

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